Johann Gottlob Werner (1777-1822), a student of Hoffmann, the organist of Borna, was successively organist in Freiburg Cathedral, cantor and organist of Hohenstein and organist and music director at Merseburg Cathedral. He is today best remembered for his hymn tune "Ratisbon." He published Eight Chorale Preludes for Organ in Leipzig in 1818.
The organ case at Merseburg Cathedral, where J. G. Werner was Organist and Director of Music from 1819 to 1822. The case now contains a Ladegast organ dating from the middle of the nineteenth century. Image courtesy of Wikipedia Commons